Tommy drew in his breath sharply. “Now we try it,” he said tensely. “I was trying to work this as the mirrors of the dimensoscope were fitted. Let’s see.”

He took a long piece of soft-iron wire and fed it into the hollow of the first magnet. He saw it come out and bend stiffly to enter the hollow of the second. It required force to thrust it through. It went still more stiffly into the third magnet. It required nearly all his strength to thrust it on, and on…. The end of it vanished. He pushed two feet or more of it beyond the last place where it was visible. It went into the magnet that hurt one’s eyes. After that it could not be seen.

Tommy’s voice was strained.

“Swing the dimensoscope, Smithers,” he ordered. “See if you can see the wire. The end of it should be in the other world.”

It seemed an age, an aeon, that Smithers searched. Then:

“Move it,” he said.

Tommy obeyed.

“It’s there,” said Smithers evenly. “Two or three feet of it.”